WO2011043594A2

WO2011043594A2 - Method and apparatus for relaying uplink signals

Info

Publication number: WO2011043594A2
Application number: PCT/KR2010/006835
Authority: WO
Inventors: 홍성권; 권기범; 박경민
Original assignee: (주)팬택
Priority date: 2009-10-06
Filing date: 2010-10-06
Publication date: 2011-04-14
Also published as: KR20110037422A; US20120201192A1; WO2011043594A3

Abstract

The present invention relates to a method and apparatus for relaying uplink signals, and provides a method and apparatus for relaying uplink signals which involve integrating a plurality of information blocks for signals received from a plurality of terminals to generate an integrated information block, encoding the thus-generated integrated information block, and transmitting the encoded block to a base station.

Description

Method and device for relaying uplink signal

Embodiments of the present invention relate to a wireless communication system, and more particularly, to a method and apparatus for relaying an uplink signal from a plurality of terminals to a base station in a wireless communication system.

In recent years, in communication systems, technologies for applying relays, such as relays, between a terminal and a base station have been developed for increasing cell capacity and improving performance of users in cell boundary regions. In particular, in 3GPP LTE, there is a plan to introduce a relay, and standardization activities are actively progressing.

The technology under development related to such a relay includes a "relay technology using a network code", which is actively progressed by the 3GPP LTE standardization body. In the relay technology using the network code, when there are two terminals, the information data to be transmitted to each terminal is referred to as i11, i12, ..., i1N, i21, i22, ..., i2N 'and the bits encoded therein are C11. , C12, ..., C1M, C21, C22, ..., C2M 'When the signal is transmitted in the uplink configuration is as follows. However, the actual transmission signal is modulated with respect to the encoded bits. For convenience of description, the description will be mainly focused on the transmission of the encoded bits. Signal transmission on the uplink is based on three slots. In the first slot, the first terminal transmits C11, C12, ..., C1M in the form of broadcast to the relay device and the base station. In the second slot, the second terminal transmits C21, C22, ..., C2M 'in the form of broadcast to the relay device and the base station. The relay device decodes the received signals in the first timeslot and the second timeslot under the assumption that M = M 'and generates the following signals.

In the third slot, the relay device transmits Cr1, Cr2, ..., CrM to the base station.

In general, when a terminal uses a time division multiplexer (TDM) scheme to transmit a cooperative diversity scheme to a base station together with a relay device, two slots are required and four slots are used when two terminals are used. If a network coding scheme is used, only three slots are needed and thus time resources are saved, and such a scheme is called a "compressed mode".

There is a method of implementing a compression mode by increasing a modulation order of a modulation method other than the compression mode using a network coding method. A modulation scheme in which each encoded bit is transmitted from each terminal to a base station is quadrature phase keying (QPSK), and a relay device may be transmitted in one slot using a quadrature amplitude modulation (QAM) modulation scheme. Amplitude modulation (AM) is modulated independently of the I and Q axes on the constellation of the QAM modulation scheme. This approach is called "multiple UE joint modulation". The QAM constellation defined in the existing 3GPP LTE standard is mapped by 2 bits assigned to I and Q axes, respectively, and has a difference in error correction capability according to the characteristics of the signal point set distinguished by each bit of the two bits. . To eliminate this difference, the multiple UE combined modulation scheme uses a mapping scheme different from the constellation used in 3GPP LTE (3rd Generation Partnership Project Long Term Evolution). The multiple UE coupling modulation scheme is known to exhibit a better frame error rate (FER) than a relay system employing a network code.

However, the conventional relay technology including the "relay technology using the network coding method" and the "relay technology using the multiple UE combined modulation scheme" and the like, if the length of the frame in each terminal is different from each other to handle this There is a problem that an algorithm is required, and the conventional relay technology also has a problem in that a new rate matching algorithm for link adaptation between a relay device and a base station must be developed. In addition, the conventional relay technology has a problem in that complex combination rules must be applied to combine signals transmitted after being modulated according to different modulation schemes when the modulation schemes in each terminal are different. In addition, the conventional relay technology, there is a problem in combining the signals received from more than two terminals. In addition to these problems, when the conventional relay technology applied to 3GPP LTE, there are also problems that many changes occur.

In this background, an embodiment of the present invention provides a relay method and a relay method of an uplink signal that can be applied without many changes even if applied to an existing communication system such as 3GPP LTE.

In particular, one embodiment of the present invention, there is no problem in combining the signals received from more than two terminals, and if the length of the frame in each terminal is different from each other, no separate algorithm for processing this, relay device There is no need to develop a new rate matching algorithm for link adaptation between the base station and the base station. If the modulation schemes in each terminal are different, combining signals transmitted after being modulated according to different modulation schemes To provide a relay method and a relay device that do not require complex combination rules.

Another embodiment of the present invention provides a relay method and a relay device capable of informing a base station whether a decoding of a signal received at a terminal is successful, while relaying an uplink signal from the terminal to the base station.

An embodiment of the present invention, an apparatus for relaying an uplink signal from a plurality of terminals to a base station, comprising: an integration unit for generating a unified information block by integrating a plurality of information blocks for signals received from a plurality of terminals; A coding unit coding the integrated information block; And a modulation unit for modulating the coded integrated information block.

In addition, an embodiment of the present invention, in the relay device relays the uplink signal from the plurality of terminals to the base station, the integrated information block by integrating a plurality of information blocks for the signals received from the plurality of terminals Generating integration step; Coding the integrated information block; And a modulation step of modulating the coded integrated information block.

Another embodiment of the present invention provides a device for relaying an uplink signal from a plurality of terminals to a base station, wherein the device relays a signal on the uplink transmitted from the plurality of terminals to the base station. In order to transmit the decoding success information in the decoding process for each of the signals on the uplink to the base station, and transmits the decoding success information using the uplink control information channel, or to the signal to be relayed to the base station Provided is a relay device for an uplink signal, characterized in that the transmission including the decoding success information.

Further, another embodiment of the present invention, in the relay device relays uplink signals from a plurality of terminals to the base station, the method, the process of decoding the signal on the uplink transmitted from the plurality of terminals A first step of relaying to the base station after coarse; And a second step of transmitting decryption success information in the decoding process to the base station, wherein the second step includes transmitting the decryption success information using the uplink control information channel, In the first step, the relay method of the uplink signal, characterized in that the transmission to include the decoding success information in the signal to be relayed to the base station.

As described above, according to an embodiment of the present invention, even if applied to an existing communication system such as 3GPP LTE, there is an effect of providing an uplink signal relay method and a relay device applicable without many changes.

In particular, according to an embodiment of the present invention, there is no problem of combining signals received from more than two terminals, and if a length of a frame in each terminal is different, a separate algorithm for processing the same is not required, and a relay There is no need to develop a new rate matching algorithm for link adaptation between the device and the base station, and if the modulation schemes in each terminal are different, combining signals transmitted after being modulated according to different modulation schemes There is an effect to provide a relay method and a relay device that does not require complex coupling rules to do so.

According to another embodiment of the present invention, while relaying an uplink signal from the terminal to the base station, there is an effect of providing a relay method and a relay device that can inform the base station whether the decoding success of the signal received at the terminal.

1 is a diagram schematically illustrating a wireless communication system to which an embodiment of the present invention is applied.

2 is a block diagram of a relay device of an uplink signal according to an embodiment of the present invention.

3 is a block diagram of an integrated unit included in an uplink signal relay device according to an embodiment of the present invention.

4 is an exemplary diagram of a plurality of information blocks for an uplink signal for relaying according to an embodiment of the present invention.

5 is a detailed configuration diagram of an integration scheme for an information block according to an embodiment of the present invention.

6 is a conceptual diagram for reordering information blocks when integrating an information block according to an embodiment of the present invention.

7 is three exemplary diagrams for reordering information blocks according to an embodiment of the present invention.

FIG. 8 is a diagram illustrating an information field for indicating whether decoding of an information block is successful according to an embodiment of the present invention.

9 is a flowchart illustrating a relay method of an uplink signal according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating the application of an uplink signal relay method to 3GPP LTE according to an embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in describing the component of this invention, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected to or connected to that other component, but there may be another configuration between each component. It is to be understood that the elements may be "connected", "coupled" or "connected".

1, the relay device 100 of the uplink signal according to an embodiment of the present invention, a plurality of terminals (terminal 1 (11), terminal 2 (12), ..., terminal k (13) ) Is a device for relaying a signal on the uplink from the base station 20.

The relay device 100 of the uplink signal receives the encoded signals from the plurality of

terminals

11, 12,..., 13, decodes the received signal, and uses the plurality of

terminals

11, 12 as the decoded signals. ....., 13) Create a single "integrated information block" using a plurality of information blocks for each, and transmits the generated integrated information block to the base station 20 through the encoding process. Here, the coding scheme may be various coding schemes including turbo coding.

Hereinafter, a relay device 100 of an uplink signal and a method of relaying an uplink signal (uplink signal) provided by the relay device 100 according to an embodiment of the present invention will be described with reference to various drawings. do.

2 is a block diagram of a relay device 100 of an uplink signal according to an embodiment of the present invention.

2, the relay device 100 of the uplink signal according to an embodiment of the present invention, the uplink signal from the plurality of terminals (11, 12, ..., 13) to the base station 20 An apparatus for relaying, comprising: an aggregator 210 for generating an integrated information block by aggregating a plurality of information blocks for signals received from a plurality of

terminals

11, 12,. The coding unit 220 codes the integrated information block generated by the integrator 210 according to a predefined coding scheme, and modulates the integrated information block coded by the coding unit 210 according to a predefined modulation scheme. And a modulator 230.

Each of the aforementioned information blocks may be a transport block (TB) obtained by decoding signals received from the plurality of

terminals

11, 12,..., 13, respectively. Such an information block may have a different configuration form as shown in FIG. 4 according to a result of decoding. Referring to the example of FIG. 4, an information block, which may be a transport block obtained by decoding a signal transmitted from a specific terminal, is composed of decoded bits as shown in FIG. 4, the soft decision value indicating whether the decoding is successful as shown in (b) of FIG. 4 or the decoded bits as shown in (c) of FIG. It may be configured by adding an error detection code such as a cyclic redundancy check (CRC).

In other words, when the decoding succeeds, each of the plurality of information blocks is a transport block (see FIG. 4A) having a configuration form including the decoded bit block. When decoding fails, each of the plurality of information blocks includes a transport block having a configuration form that includes a soft decision value (eg, a soft decision probability value or a log value of a soft decision probability value) in units of bits (see FIG. 4B). May be). In addition, each of the plurality of information blocks, an error detection code, such as a cyclic redundancy check (CRC) is added, but if the decoding fails, the error detection code may not be added (see Fig. 4 (c)). ).

Referring to FIG. 3, the integrating unit 210 for generating an integrated information block by integrating a plurality of information blocks for signals received from the plurality of

terminals

11 and 12 may include a plurality of

terminals

11, 12. Information for selecting all or a portion of the plurality of information blocks 111, 112, ..., 113 as a selection information block, which may be a transport block (TB) obtained by decoding the signals received from. The block selector 310, the reordering unit 320 for reordering the selected information block selected by the information block selecting unit 310 according to a predefined reordering rule, and the reordered ordering information block And an integrated information block generator 330 for generating integrated information blocks by integrating them.

The above-described information block selection unit 310, regardless of whether the decoding success for each of a plurality of information blocks (information block 1 (111), information block 2 (112), ..., information block k (113)). The entirety of the plurality of information blocks 111, 112,..., 113 may be selected as the selection information block and transferred to the reordering unit 320. In addition, the above-described information block selection unit 310 decodes among the plurality of information blocks 111, 112,..., 113 based on whether or not each of the plurality of information blocks 111, 112,..., 113 is successfully decoded. The selected part may be selected as the selection information block and transmitted to the reordering unit 320.

As described above, when the information block selection unit 310 selects 'all' of the plurality of information blocks 111, 112,..., 113 as a selection information block and transmits the selection information block to the reordering unit 320, the selection information is selected. The selection information block that fails to decode among the blocks is transmitted as a soft decision value (eg, soft decision probability value or its log value form), and the selection information block that has successfully decoded among the selection information blocks is a hard decision value. Value, for example, a binary bit value such as 0 or 1, or a corresponding probability value.

Meanwhile, as described above, when the information block selector 310 selects, as a selection information block, a portion of the plurality of information blocks 111, 112,..., 113 that has been successfully decoded, the plurality of information blocks 111, 112. Among the information blocks that fail to decode among the ..., 113, the transmission to the base station 20 is completely excluded without special processing, or in some cases, the resources allocated for signal transmission to the base station 20 (for example, May be transmitted on the uplink to the base station 20 in a resource different from the resource allocated for the signal transmission or in a frequency or time).

As shown in FIG. 3, the relay device 100 of the uplink signal according to the embodiment of the present invention illustrated in FIG. 2 may perform decoding of a plurality of information blocks 111, 112,..., 113. The apparatus may further include a signaling unit 350 for transmitting signaling information on the successful information block and the information block on which the decoding has failed to the base station 20.

The above-described signaling unit 350 selects the signaling information only when the information block selection unit 310 selects a portion of the plurality of information blocks 111, 112,..., 113 that has been successfully decoded as the selection information block. 20 can be sent. The signaling unit 350 may inform not only the base station 20 but also the coding unit 220 of signaling information about an information block on which decoding is successful and an information block on which decoding has failed.

The above-described signaling unit 350 transmits such signaling information using an uplink control information channel or all or some of the plurality of information blocks are selected as selection information blocks and integrated into one integrated information block. May be transmitted in the form of a header or an appendix.

The above-mentioned uplink control information channel, for example, includes a physical uplink control channel (PUCCH) in 3GPP LTE (3rd Generation Partnership Project Long Term Evolution (LTE)). In addition to these physical uplink control channels, any control channel can be used if defined.

As described in the example illustrated in FIG. 8A, the aforementioned signaling information includes a plurality of information blocks 111, 112,..., 113 corresponding to each of the plurality of

terminals

11, 12,..., 13. The decoding success or failure indication code 820 may be included. That is, the number of decoding success indication code 820 is the number k of the plurality of terminals or the number k of the plurality of information blocks. For example, in the decoding success indication code for each terminal or information block, if the decoding succeeds (Success), the information block is set to '1' in the field corresponding to the information block, the information block is If decryption fails, '0' is set in the field corresponding to the information block.

In addition, the signaling information described above may further include unique group codes 810 for the plurality of

terminals

11, 12,..., 13 in addition to the decoding success indication code 820 for each terminal or information block. It may also include.

In FIG. 8B, signaling may be configured by assigning different codes to each case indicating success of decoding. As shown in (b) of FIG. 8, the signaling method as shown in FIG. 8 (b) is an independent code allocation method for each case. As shown in FIG. Compared to the expression, the code of each original terminal (UE) is already existing in the form of C, and it is proposed in the concept that a code corresponding to the combination of each terminal (UE) may be allocated separately. Option. In this case, since the code may not be allocated for the entire failure, a gain in signaling efficiency may be obtained.

Referring to FIG. 3, in the information block selection unit 310 included in the integrating unit 210, a transport block obtained by decoding signals received from a plurality of

terminals

11, 12,. After selecting all or part of the plurality of information blocks 111, 112,..., 113, which may be a TB (Transport Block), as a selection information block, the reordering unit 320 is selected by the information block selecting unit 310. The selection information block may be reordered according to a predefined reordering rule.

The reordering unit 320 reorders the selection information blocks according to a reordering rule previously defined in units of bits, blocks, or the like. The concept of such reordering is illustrated in FIG. 6. In FIG. 6, however, it is assumed that information block 1 (111), information block 2 (112), ..., and information block k (113) are selected as the selection information block, so that the selection information block is an integrated information block (600). Incorporated into

In this case, the reordering rule may include, for example, a rule of connecting selection information blocks in series, a rule of randomly or interleaving the selection information blocks in blocks or bits, and reselecting the selection information blocks in a switch form. It may include one or more of the ordering rules. Three rules illustrated as reordering rules are shown in FIG. In FIG. 7, however, it is assumed that information block 1 (111), information block 2 (112), ..., and information block k (113) are selected information blocks. 7 (a) is reordered according to a reordering rule for connecting information block 1 (111), information block 2 (112), ..., and information block k (113) in series to form an integrated information block ( 600 is incorporated. As described above, according to a reordering rule connected in series, error correction capability may be different according to the position of the information block, so that the information blocks of each terminal possible are distributed evenly with respect to the entire integrated information block 600. It may be desirable.

Accordingly, when the number of information blocks of a terminal is large or the bit lengths of the information blocks of each terminal are different, an algorithm for evenly distributing the information blocks is required. To this end, as shown in (b) of FIG. 7, information block 1 (111), information block 2 (112), ..., and information block k (113) are randomly or block interleaved to have different lengths. The integrated information block 600 may be generated by uniformly distributing a plurality of information blocks. As an example of an interleaver for such interleaving, an interleaver in the form of a subblock interleaver used in 3GPP LTE R8 may be applied.

In addition, as shown in FIG. 7C, the integrated information block 600 is selected while selecting the information block using a switch set such that the selection frequency is constant for each information block 111, 112,..., 113. ) Can be configured. This method of reordering the selection information blocks in the form of a switch, for example, may be configured to switch the information blocks once every fixed period at the same rate in the simplest form, although not showing optimal performance. As such, the method of switching once per cycle is simpler than using a complicated switching algorithm, and in some cases, there may be no significant difference in practical performance.

The integrated unit 210 included in the relay device 100 of the uplink signal according to the embodiment of the present invention described above with reference to FIG. 3 is assigned to each of the selected information blocks selected by the information block selector 310. An error detection code attaching part 340 may be further added to the error detection code such as CRC or the like, or to add an error detection code such as CRC to the entire integrated information block in which the selection information block is integrated.

The error detection code attaching unit 340 adds the error detection code to each of the selection information blocks, whether or not the selection information blocks are all or part of the plurality of information blocks 111, 112, ..., 113, and the like. An error detection code may be added only to each selection information block that has been successfully decoded among the blocks, and an error detection code may not be added to each selection information block that has failed decoding.

In addition, the above-described error detection code attaching unit 340 is an error for the entire integrated information block in which the selection information block is integrated, whether or not the selection information block is all or part of the plurality of information blocks 111, 112, ..., 113. When the detection code is added, an error detection code may be added to all blocks of only the selection information block that has been successfully decoded among the selection information blocks integrated into the integrated information block.

Referring to FIG. 2, the relay device 100 for an uplink signal according to an embodiment of the present invention may include a coding unit before the modulation unit 250 modulates the integrated information block coded by the coding unit 220. A rate matching unit 230 for rate matching the integrated information block coded by 220 may be further included, and an interleaving unit 240 for interleaving the rate matched integrated information block.

In the uplink signal relay apparatus 100 illustrated in FIG. 2, the interleaving function is performed after rate matching, which is an applicable configuration diagram of a release 99 system. This is merely an exemplary configuration, and in some cases, for example, in a Release 8 system, this may be integrated. That is, the rate matching unit 230 and the interleaving unit 240 may be an interleaving / rate matching unit that may be integrated and perform its function. In addition, the interleaving unit 240 interleaving (or subblock interleaving) may be included in the rate matching unit 230.

As described above, all or a part of the plurality of information blocks 111, 112,..., 113 are selected as the selection information block to integrate the selected selection information block to generate the integrated information block, and the generated integrated information block. After the coding, rate matching, and interleaving process, the modulator 250 modulates according to a predetermined modulation scheme. In this case, as an example, the modulator 250 may modulate the integrated information block by using quadrature amplitude modulation (QAM), and transmit the modulated information block to the base station 20. In this case, the encoded bits of the integrated information block may have an amplitude modulation (AM) independently of the divided axes (I-axis, Q-axis, etc.) on the constellation of the QAM modulation scheme. The constellation of the QAM modulation method used here can use the constellation used in the conventional 3GPP LTE as it is, and any constellation can be used if the constellation of the gray mapping method is used. Has

The signal on the uplink from the plurality of terminals (11, 12, ..., 13) performed by the relay device (100) of the uplink signal according to the embodiment of the present invention described above to the base station (20) A method of relaying will be briefly described with reference to FIG. 9.

9 is a flowchart illustrating a method of relaying an uplink signal provided by a relay device 100 according to an embodiment of the present invention.

9, a relay device 100 according to an embodiment of the present invention relays an uplink signal on an uplink from a plurality of

terminals

11, 12,..., 13 to a base station 20. The method comprises the step of integrating a plurality of information blocks 111, 112,..., 113 for signals received from a plurality of

terminals

11, 12,. S900, a coding step S902 of coding the generated unified information block, a modulation step S904 of modulating the coded unified information block, and the like.

The flowchart of the relaying method of the uplink signal shown in FIG. 9 is schematically illustrated as including only an integration step S900, a coding step S902, and a modulation step S904, but with reference to FIGS. 1 to 8. All functions and operations performed by the relay device 100 of the uplink signal described above may be added as steps for the relay method of the uplink signal.

Hereinafter, a method of relaying an uplink signal from the plurality of

terminals

11, 12,..., 13 to the base station 20 will be described by applying to 3GPP LTE. Hereinafter, as applied to 3GPP LTE, the terminal (11, 12, ..., 13) as a UE (User equipment, hereinafter referred to as "UE"), the base station 20 is referred to as an eNB (enhanced Node B, hereinafter " the information block is called a transport block (TB) (hereinafter referred to as "TB" or "UE TB"), and the integrated information block into which the information block is integrated is called an integrated TB. .

Although the method of relaying an uplink signal from the plurality of

terminals

11, 12,..., 13 to the base station 20 to the 3GPP LTE disclosed herein, the relay device 100 shown in FIG. 2. Follow the instructions as it is done. As illustrated in FIG. 2, a plurality of UE TBs are configured through aggregation of UE TBs by the integrator 210 to form an aggregation TB in the form of aggregation to generate a signal to be transmitted to a channel along a 3GPP system. . Here, the encoding scheme may be various, but basically assumes a turbo encoding scheme.

UE TB integration, as shown in FIG. 3, UE TBs are input to the reordering unit 320 after the UE TB selection process by the information block selection unit 310 to change the order of the bit unit is a coding block It is transmitted to the coding unit 220. Here, the UE TBs mean a result decoded from a signal received from the UE in the relay device 100. Therefore, depending on the result of the decoding process, the UE TB may have a different configuration. For example, if the decoding is successful, the UE TB means a decoded bit block, and if the decoding fails, the UE TB indicates a soft decision value (eg, soft decision probability value or log form value of probability) that is output as a result of the turbo decoding process. Can mean.

The UE TB may be configured with or without an error detection code such as CRC. If the error detection code is added, the error detection for each UE can be performed and the efficiency can be increased by configuring a hybrid automatic repeat request (HARQ) method, but considering the CRC added to each UE, the required control resources are large. If you do not attach the error detection code but attach the entire combined TB, then you have the opposite advantages and disadvantages. When the UE TB is configured by the soft decision value, that is, the error detection code is meaningless for the UE TB which failed to be decoded, the error detection code is not added in this case.

In consideration of the success and failure of the decoding, the selection of the UE TB to be delivered to the reordering unit 320 may be configured by the information block selecting unit 310 in several ways as follows.

In a first manner, all UE TBs may be passed to the reordering unit 320 regardless of the success or failure of decryption. At this time, all the UE TB is selected as the selection information block.

In this case, UE TBs that fail to decode may be output in the form of soft decision probability values or log values thereof, and turbo codes for the soft decision values may be encoded and modulated by an algorithm such as soft information relaying (SIR). When constructing the SIR, a hard decision value for a binary value (e.g., expressed as a probability value, a probability value of 1.0 is assigned to a bit determined as 1 by a hard decision bit value for a successful UE TB) , A probability value of 0.0 is assigned to 0, and a log value can be assigned to a bit determined as 1, and a very large value with a negative sign can be assigned to 0). For TB, the soft decision value output from the decoder is allocated. 5 is a diagram showing this.

When all UE TBs are delivered to the reordering unit 320 regardless of success or failure of decryption, information on which UE TBs have a soft decision value, that is, which UE TBs failed to decrypt (decryption success or failure). Information) does not have to be transmitted to the coding unit 220 that performs turbo encoding. Also for the eNB, no special signaling is needed to inform which UE TB has a soft decision value, i.e., information on which UE TB failed to decode (decoding success information).

In addition, if all UE TBs are delivered to the reordering unit 320 regardless of the success or failure of decryption, an error detection code may be added to the individual UE TBs, but the error detection code is applied to the individual UE TBs. If not, the error detection code only needs to be configured and added to the entire block that has been successfully decoded.

Unlike the first scheme described above, in the second scheme, only the UE TB having succeeded in decoding may be transmitted to the reordering unit 320. In this case, the information block selector 310 selects only the UE TB that has been successfully decoded among the plurality of UE TBs as the selection information block and transmits the selected information block to the reordering unit 320.

In the case of this second scheme, that is, when only the successful decryption of the UE TB is delivered to the reordering unit 320, the UE TB in which the decryption has failed is basically completely excluded from transmission to the eNB without special processing. However, in some cases, the UE TB in which decryption fails may be allocated and transmitted in a resource allocated for transmission or for a UE TB in which other resources (frequency or time, etc.) fail in decryption. If a UE TB in which decoding has failed is transmitted, the UE TB in which the decoding has failed is composed of signals reconstructed by the SIR scheme for soft decision value or in baseband form (I, Q sample form) before being decoded. May be retransmitted as a signal.

In addition, in the case of the second method, that is, when only the successful decoding of the UE TB is transmitted to the reordering unit 320, after the reordering process by the reordering unit 320, in the coding unit 220 For the turbo code of, information (decoding success information or signaling information) on which UE TB is selected and which UE TB is not selected is transmitted to the coding unit 220 which performs turbo encoding according to whether decoding is successful. Should be.

In addition, in the case of this second scheme, that is, when only the successful decryption of the UE TB is transmitted to the reordering unit 320, an error detection code is added to the individual UE TB, or only for the entire block of the UE TB that has been successfully decrypted. The error detection code may be configured and added.

In addition, in this second scheme, a signaling process for transmitting information (decoding success information or signaling information) about which UE TB succeeded in decryption and which UE TB failed in decryption is required.

As such, the signaling for transmitting information on which TB succeeded in decoding to the eNB may include the uplink relay method according to the above-described embodiment of the present invention, that is, all or part of a plurality of UE TBs. Is not limited to a method of encoding and transmitting an integrated TB by integrating the above, but may also be commonly applied to a network coding scheme, a multiple UE combined modulation (MUJM) scheme, or another type of compression scheme. In addition, as a signaling method for transmitting information on which TB has been successfully decoded to the eNB, the relay is not a cooperative method utilizing a link from the UE to the eNB but relays the signal of the UE in a hopping format without using the UE link signal. The same may be applied to the method of transmitting through the same. That is, even in a general compression scheme, if a relay device can process UE TB differently according to decoding success for each UE, signaling for transmitting decoding success to the eNB determines the performance of a communication system such as signal transmission. Can be an important factor.

For this signaling, the code of the group code is assigned to each UE group, and the decoding success is allocated by assigning the individual bits (that is, the decoding success indication code for each terminal or information block) by the number of members (that is, the UE) of the UE group. It can indicate whether or not. For example, if the number of UEs is k, as shown in FIG. 8, a code indicating the UE group (group code 810) and a field indicating whether the decryption of the UE TB is successful for each k UEs in the UE group (ie Or decoding success indication code per terminal or information block) or may be configured by an independent code allocation method to indicate whether decoding is successful.

As such, the manner of notifying whether the decoding is successful for each UE TB may be included in a control information channel (eg, PUCCH of 3GPP LTE) on the uplink to the eNB. Alternatively, the information indicating whether or not the decoding was successful may be included in the integrated TB in the form of a header or an appendix.

In addition, as applied to 3GPP LTE, information on whether or not decoding is successful may be delivered in the form of an initial value or masking of a CRC value, which is one of error detection codes. In this case, an error detection code may be attached to each UE TB or an error detection code may be added to the entire integrated TB for information transmission. Also in the CRadio Network Temporary ID) form applied in 3GPP LTE, the form as shown in FIG. 8 can be configured.

If the number of UEs in the form of a UE group is 1, there may be no field indicating whether the decoding succeeds itself (which may indicate success as 0 or 1), and a group code indicating a UE group may identify the UE. Can be indicated. In the second scheme in which only the successful decryption of the UE TB is transmitted to the reordering unit 320, the grant of a code identifying the UE itself indicates success or failure of the decoding. In the case where the code for identifying the UE is assigned in this way, it becomes a cooperative relay method of the basic type, not the compression mode, and it can be seen that the UE group type is a superset of the method indicating the successful decoding in the UE type. have. Therefore, the method of indicating whether the decoding succeeded to the UE group may be a method of transmitting or not decoding success of the basic cooperative relay method.

In the reordering process, as shown in FIG. 6, the bit order of each UE TB is changed in units of bits. The operation of changing the bit order may be a multiplexing form or a random order or block interleaving form. The simplest of these reordering methods, as shown in (a) of FIG. 7, is to connect UE TBs in order through serial configuration. In this case, since the error correction capability may vary greatly depending on the location of the UE TB, it may be desirable for each possible UE TB to be evenly distributed in all the integrated TBs. Therefore, when the number of UE TBs is large or the bit length of each UE TB is different, an algorithm for evenly distributing UE TBs is needed. In this case, as shown in (b) of FIG. 7, when a block or a random interleaver is used, the order may be reconfigured to achieve a uniform distribution of UE TB having a plurality of different lengths. In one example, the order may be reconfigured using the subblock interleaver of 3GPP LTE (R8). In addition, as shown in (c) of FIG. 7, when reordering according to the method of selecting each UE TB in the form of a switch, if the selection frequency of each switch is determined according to the bit length of each UE TB, a uniform distribution is obtained. The entire block can be constructed. As such, as shown in FIG. 7C, when reordering according to a method of selecting each UE TB in the form of a switch, as an example, the information block is the simplest form of implementation although it does not show optimal performance. It can also be configured to switch the form once every cycle at the same ratio.

10 shows an embodiment of the integration of the UE TB according to an embodiment of the present invention. In FIG. 10, for convenience of description, two UEs including the UE 1 1001 and the UE 2 1002 are connected to the eNB 1000 and the relay device 100. The modulation scheme from the UE 1 1001 and the UE 2 1002 to the relay device 100 or the eNB 1000 is QPSK (Quadrature PhaseKeying, hereinafter referred to as “QPSK”), and the relay device 100 uses the eNB 1000. ) Is composed of QAM (Quadrature Amplitude Modulation, hereinafter referred to as "QAM"). In this case, in the case of the entire block (integrated TB) input to the turbo code, compared to the conventional multiple UE combined modulation (MUJM) method, the doubled and the relative interleaving gain (interleaving gain) is generated.

In the relay device 100 of the uplink signal for relaying a signal on the uplink from the plurality of terminals (11, 12, ..., 13) to the base station 20 according to another embodiment of the present invention, such an uplink When the relay device 100 of the link signal relays the signals on the uplink transmitted from the plurality of

terminals

11, 12,..., 13 to the base station 20, each of the signals on the uplink is applied to each of the signals on the uplink. Decoding success information in the decoding process can be transmitted to the base station 20. In order to transmit the decoding success information (corresponding to the 'signaling information' described above) to the base station 20, the relay device 100 transmits the decoding success information using the uplink control information channel, or Decoding success information may be included in the signal to be relayed in the form of a header or an appendix, and may be transmitted.

The aforementioned uplink control information channel may include, for example, a physical uplink control channel (PUCCH).

In addition, the signal to be relayed to the base station 20 that can include the decoding success information, the plurality of terminals (11, 12, 12) through a network coding scheme or a multiple UE joint modulation (MUJM) scheme, etc. ... is an information block generated from a signal transmitted in ..., 13, or a signal transmitted from a plurality of terminals (11, 12, ..., 13) according to the method described above with reference to FIGS. And an integrated information block generated. In this case, the integrated information block may be a combination of all of the individual information blocks in which the signals transmitted from the plurality of

terminals

11, 12,. It may have been done.

As described above, the decryption success information includes the decryption success indication code 820 for each of the plurality of

terminals

11, 12,..., 13, and the plurality of

terminals

11, 12,. 13 may be included as a field, or may be configured through independent code assignment.

In the method for relaying the uplink signal relay device 100 according to another embodiment of the present invention relays a signal on the uplink from the plurality of terminals (11, 12, ..., 13) to the base station 20, The method includes a first step of relaying a signal on an uplink transmitted from a plurality of

terminals

11, 12,..., 13 to a base station 20 after a decoding process, and whether the decoding succeeds in the decoding process. And a second step of delivering information to the base station 20. In the above-described second step, the decoding success information may be transmitted using the uplink control information channel, or the decoding success information may be included in the signal to be relayed to the base station in the first step.

As described above, according to an embodiment of the present invention, even if applied to an existing communication system such as 3GPP LTE, it is possible to provide an uplink signal relay method and a relay device applicable without many changes. In particular, there is no problem of combining signals received from more than two terminals, and if a frame length in each terminal is different, a separate algorithm for processing the same is not required, and link adaptation between the relay device and the base station (Link Adaptation) There is no need to develop a new Rate Matching algorithm for the CDMA, and if the modulation schemes in each terminal are different, a complex combining rule is required to combine the transmitted signals modulated according to different modulation schemes. The relay method and the relay apparatus which do not need to be provided can be provided.

In addition, according to another embodiment of the present invention, while relaying an uplink signal from the terminal to the base station, it is possible to provide a relay method and a relay device that can inform the base station whether the decoding success of the signal received at the terminal.

In the above description, all elements constituting the embodiments of the present invention are described as being combined or operating in combination, but the present invention is not necessarily limited to the embodiments. In other words, within the scope of the present invention, all of the components may be selectively operated in combination with one or more. In addition, although all of the components may be implemented in one independent hardware, each or all of the components may be selectively combined to perform some or all functions combined in one or a plurality of hardware. It may be implemented as a computer program having a. Codes and code segments constituting the computer program may be easily inferred by those skilled in the art. Such a computer program may be stored in a computer readable storage medium and read and executed by a computer, thereby implementing embodiments of the present invention. The storage medium of the computer program may include a magnetic recording medium, an optical recording medium, a carrier wave medium, and the like.

In addition, the terms "comprise", "comprise" or "having" described above mean that the corresponding component may be included, unless otherwise stated, and thus excludes other components. It should be construed that it may further include other components instead. All terms, including technical and scientific terms, have the same meanings as commonly understood by one of ordinary skill in the art unless otherwise defined. Terms commonly used, such as terms defined in a dictionary, should be interpreted to coincide with the contextual meaning of the related art, and shall not be construed in an ideal or excessively formal sense unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

CROSS-REFERENCE TO RELATED APPLICATIONCROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority under No. 119 (a) (35 USC § 119 (a)) of the US Patent Act No. 10-2009-0094856, filed with South Korea on October 6, 2009. All content is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason as above for a country other than the United States, all the contents thereof are incorporated into this patent application by reference.

Claims

An apparatus for relaying an uplink signal from a plurality of terminals to a base station,

An integration unit for generating an integrated information block by integrating a plurality of information blocks for signals received from a plurality of terminals;

A coding unit coding the integrated information block; And

A modulator for modulating the coded integrated information block

Relay device for an uplink signal comprising a.
The method of claim 1,

Each of the plurality of information blocks,

And a transport block (TB) obtained by decoding signals received from the plurality of terminals, respectively, wherein the configuration of the uplink signal is different depending on the decoding result.
The method of claim 2,

Each of the plurality of information blocks,

If the decoding succeeds, the transport block has a configuration form including a decoded bit block,

And if the decoding fails, the transport block having a configuration form including a soft decision value in bits.
The method of claim 3, wherein

Each of the plurality of information blocks,

An error detection code is added, but when the decoding fails, the error detection code is not added.
The method of claim 1,

The integrated unit,

An information block selection unit for selecting at least a part of the plurality of information blocks as a selection information block;

A reordering unit for reordering the selection information block according to a predefined reordering rule; And

Integrated information block generation unit for generating the integrated information block by integrating the re-ordered selection information block

Relay device for an uplink signal comprising a.
The method of claim 5,

The information block selection unit,

Regardless of whether the decoding is successful for each of the plurality of information blocks, the entirety of the plurality of information blocks is selected as the selection information block and transferred to the reordering unit,

Based on whether or not the decoding success for each of the plurality of information blocks, a portion of the successful decoding of the plurality of information blocks to select the selection information block, characterized in that for transmitting to the reordering unit.
The method of claim 6,

In the information block selecting unit, when the entirety of the plurality of information blocks is selected as the selection information block and delivered to the reordering unit,

The selection information block that fails to be decoded among the selection information blocks is transmitted with a soft decision value, and the selection information block that has been successfully decoded among the selection information blocks is transmitted as a hard decision value.
The method of claim 6,

The relay device,

And a signaling unit which transmits signaling information about an information block in which decoding succeeds and an information block in which decryption fails among the plurality of information blocks to the base station.
The method of claim 8,

The signaling unit,

And transmitting the signaling information to the base station only when the information block selection unit selects, as the selection information block, a portion of the plurality of information blocks that have been successfully decoded.
The method of claim 8,

The signaling unit,

And relaying the signaling information using the uplink control information channel or including the signaling information in the integrated information block and transmitting the signaling information.
The method of claim 10,

The control information channel,

Relay device for uplink signal, characterized in that it comprises a Physical Uplink Control Channel (PUCCH).
The method of claim 8,

The signaling information,

The uplink transmission apparatus of the relay, characterized in that it comprises a decoding success information indicating code for each of the plurality of information blocks corresponding to each of the plurality of terminals.
The method of claim 12,

The signaling information,

The relay device of the uplink signal, characterized in that it further comprises a group code for the plurality of terminals.
The method of claim 6,

The integrated unit,

An uplink signal further comprising an error detection code attaching portion for each of the selection information blocks, or an error detection code attachment portion for adding an error detection code to the entire integrated information block in which the selection information block is integrated. Relay device.
The method of claim 14,

The error detection code attachment portion,

When an error detection code is added to each of the selection information blocks, an error detection code is added only to each of the selection information blocks that have been successfully decoded among the selection information blocks.

If an error detection code is added to the entire integrated information block in which the selection information block is integrated, an error detection code is applied to all the blocks of the selection information block that have successfully decoded among the selection information blocks integrated into the integrated information block. The relay device of the uplink signal, characterized in that the addition.
The method of claim 1,

Before modulating the coded integrated information block,

A rate matching unit for rate matching the coded integrated information block; And an interleaving unit interleaving the rate matched integrated information block.
The method of claim 1,

The modulator,

The relay device of the uplink signal, characterized in that for modulating the integrated information block using Quadrature Amplitude Modulation (QAM).
In the relay device relays uplink signals from the plurality of terminals to the base station,

An integrating step of integrating a plurality of information blocks for signals received from a plurality of terminals to generate an integrated information block;

Coding the integrated information block; And

Modulating the coded integrated information block

Relay method of an uplink signal comprising a.
An apparatus for relaying an uplink signal from a plurality of terminals to a base station,

The device,

When relaying the signals on the uplink transmitted from the plurality of terminals to the base station, the decoding success information in the decoding process for each of the signals on the uplink is transmitted to the base station,

And transmitting the decoding success or failure information using the uplink control information channel or including the decoding success or failure information in a signal to be relayed to the base station.
The method of claim 19,

The control channel of the uplink,

Relay device for an uplink signal, characterized in that it comprises a physical uplink control channel (PUCCH).
The method of claim 19,

The signal to relay to the base station,

An information block generated from signals transmitted from the plurality of terminals through a network coding scheme or a multiple UE joint modulation (MUJM) scheme;

Relay device of an uplink signal, characterized in that the integrated information block generated by combining the signals transmitted from the plurality of terminals.
The method of claim 20,

The integrated information block,

The relay device of the uplink signal, characterized in that only the information block is successfully decoded from the individual information blocks decoded each of the signals transmitted from the plurality of terminals.
The method of claim 19,

The decryption success information,

And a decoding code indicating whether each of the plurality of terminals has succeeded in decoding, and a group code for the plurality of terminals.
In the relay device relays uplink signals from the plurality of terminals to the base station,

The method,

A first step of relaying signals on the uplink transmitted from the plurality of terminals to the base station after being decoded; And

A second step of transmitting decryption success information in the decoding process to the base station;

Including,

The second step,

The decoding of the uplink signal, characterized in that to transmit the decoding success information using the uplink control information channel or to include the decoding success information in the signal to be relayed to the base station in the first step. Way.